The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 1992
Filed:
Feb. 14, 1990
Kenji Kawano, Atsugi, JP;
Toshinori Nozawa, Kunitachi, JP;
Hiromichi Jumonji, Tama, JP;
Tsutomu Kitou, Mito, JP;
Osamu Mitomi, Isehara, JP;
Toshio Suzuki, Tokyo, JP;
Mitsuaki Yanagihashi, Mitaka, JP;
Kazuto Noguchi, Isehara, JP;
Nippon Telegraph and Telephone Company, Tokyo, JP;
Abstract
An electrically controlled optical device includes a traveling wave electrode structure, a shield conductor and a thick buffer layer having a low dielectric constant. The thickness of an overlaid layer disposed between the traveling wave electrode structure and the shield conductor, as well as the thickness of the buffer layer, is determined so that the effective index of a microwave transmitted through the traveling wave electrode structure approaches the effective index of light transmitted through an optical waveguide, so that the microwave conductor loss is reduced, and so that the characteristic impedance of the traveling wave electrode structure approaches the characteristic impedance of an associated external microwave circuit.